Improvement in stop-valves



E. C. POST. Stop-Valve.

No. 218,399. Patented Aug12, 1879.

NJETERQ, FHBTOLITHOGRAPHFJ. WASHINGTDN. D C

UNITED %reres PATENT OFFICE.

EDWARD C. POST, OF MONROE, MIOHIGAN.

. IMPROVEMENT IN STOP-VALVES.

Specification forming part of Letters Patent No. 218.399, dated August 12, 1879; application filed February 6, 1879.

To all whom it may concern:

Be it known that I, EDWARD G. Posr, of Monroe, in the County of Monroe, in the State of Michigan, have invented acertain new and useful Improvement in Stop-Valves, of which the following is a specification.

This improvement has for its object more particularly, anong other objects, a convenient and practical means of using the valve without stopping the work of the machine or engine while the valve is being repaired.

It is constructed with two parallel seats set opposite each other, between which are two pairs of wedge-shaped gates set on wedgeshaped yokes, each pair of said gates and yokes being attached to different stems, each stem working independent of the other at any desirable angle, and they conterminate between the two valve-seats intcrchangeably at pleasure.

M y invention is a double or two sten valve, each sten 'with all its parts being counterparts oi the other, except the valve-seats, which are Situated at the juncton of the stems, so as to be used in communication with either stern at pleasure-t'. e., When one valve-stein is idle for repair or other reason, then the other stem may be used at once, and all over the same steam-port; and itis also my object to provide expandin g gates in a straigh tWay-Valve, so contrived as to require but little taper upon the gates and yoke to jam them with certainty against the seats, and also that the screwstem which lifts the yoke shall only revolve in the packing, and shall not move up and down in it, as it does ordinarily.

In the drawings, a a' are the wedge-shaped yokes; b b and b' b', the wedge-shaped gates; O C', the screw-stems. f f are the spiral springs which keep the gates b 1)' in position. A Ais the gate-chamber, in which both pairs of gates perform their duty, and in which the two valve seats m w are set opposite each other.

Fi gure 1 is a vertical section of the valve, showing the one pair of gates b b,with yoke a, stem O, and spring f, in position for closing the passage, and the other pair of gates, b' b', with yoke a stem C', and spring f drawn up in reserve position-i. 6., out of use.

Fi g. 2 is a vertical section of the valve through the stem C', edgewise of gates b' b' and yoke a'.

This valve is constructed so that the two pairs of gates!) b and b' b', with their respective yokes, stems, and springs, shall travel from different points when being lowered upon the Valveseats, and they converge upon one pointt e., between the one pair of valve-seats. It will not be necessary that the two stems should be set at a right angle, as shown in the drawings; but they may be set at any other desirable angle.

Fig. 3 is a side View, Fig. 4, a vertical section, and Fig. 5 a top View, of yoke a, gates b, and spring f, showing the manner in which these parts are 'connected with each other. f is a coil-spring set' in a recess in the middle of the yoke. It sets with its upper end against the upper wall of said reeess, and at its lower end against the top of the gates b b, also at the same point upon the upper surfaces of the lugs d d, performing the duty of holding the lugs d d down upon the projections g g, as shown in Figs. 3 and 4.

Figs. 6, 7, and 8 are views of the gates I), showing the manner in which the lugs d d are arranged on the gates, so as to interlock and secure a perfect guide for the gates. These lugs are projections standing out from the inner surfaces of the gates near their upper ends,

and are of sufficient length to pass nearly through the yoke, each pair being set so that one lug will interlock above its opposing lug on the other gate, and so that its companion lug shall interlock below its opposing lug on the other gate, the whole being so made to alternate in position that they will lift the gates simultaneously and evenly, thus preventing any canting of the gates and the consequent unequal wear of the parts.

The operation of this valve is, in all its parts, different from any other with which I am acquainted, and is as follows: Suppose the valve is connected to a machine of which the chambers are, under pressure, performing the duty of closing the passage through them, as shown in Figs. 1 and 2. It may be opened by turning stem C to the right, which raises the wedged part of the yoke a from between the gates I b, the spring f still holding the gates against the bottom of the gate-chamber A until the projection g of yoke a reaches the lugs d (l, (see Figs. 8 and 4,) during which the pressure iu the ehanbers ot' the engine hits hul time to force the gates from their sents, after which the stem (J will lit't. the gates freely without causing them to rub or slide over the valve-seats, as is the czLse with the gntes ot' other valves, and which is very inju'ios to the faces of the gutes :s well ;is to those ot' of the chunber, where they :L'e opposite to z their seats, when the spring f' will compress and allow the wedgel purt ot' the woke to slide in between the inclinel surfares of the gates and force them against their sezits. Then the cover and packng-hox B may be removed, the det'ective gates taken oti', repair-ed, or renewed, as the case may be, and returned to place, all being done without exhansting or even diminishing the pressure in the chnnbers of the engine, or any less of gas thereby what ever.

The valvescats of this valve being made of u hard metal, and the faces of the gates of a. softer material, its wearing by work will be contined to the sot'ter faces only, and these may, et any time, be removed and repairel in the manner set t'oi th.

For annonia and other ice engines especially, lenky stop-valves always cause trouble, less of gas, delays, and sometimes injuries to the operatives, which troubles thisdouble valve will obviate, because, should :i leak occur from a let'ective stem, then the other may be used at once.

What I claim as new, and desire to secure by Letters Patent. is-

1. Two or more stems, 0 and C', with their sets ot' gates I; I; and b' b', yokes a and a', aul spring-s f and f', each set working trom difi'twent points ot' departure at any desimble angle in their line of travel, and terminutig upon and between the one pair of valve-seats.

2. The conbimtion ot' volte a, with its proiectios g g, springf, and gates I b. with their lgs (I l, ;irringed so as to interlock each other.

EDWARD C. POST.

VVil nesses:

JOHN M. \VAGNE.R, ANDREW J. WAGNER. 

